摘要：提出基于一种改进支持向量机算法(ν-SVR)的边坡稳定性预测方法,直接利用边坡的特征参数快速预测边坡稳定性。为解决算法中模型选择困难的问题,用留一法设计预测模型,用网格搜索法搜索最优参数。留一法可以避免传统方法中根据经验确定预测模型的缺点,较为客观地获取合适的预测模型。网格搜索法可以保证搜索到合适的参数。计算结果显示,联合运用这两种方法可以获得合适的预测模型。利用该预测模型对82个圆弧破坏边坡实例中的71个实例进行学习,对另外11个实例进行推广预测,取得了较好的效果,其预测精度明显优于一种改进BP神经网络算法和常规SVR算法,与GA-BP神经网络算法相近。在此基础上,提出基于ν-SVR算法的边坡设计方法,能够快速、准确的获取不同方案下的边坡安全系数,评价其稳定性,为选择经济合理的边坡设计方案提供决策依据。

摘要：针对实际工程中优化大规模结构耗时长问题,采用支持向量机与遗传算法相结合的优化方法。基于支持向量机建立结构近似模型,代替耗时长的有限元分析并应用遗传算法进行结构优化,形成省时、精度高、适应性强的优化方法。以某卫星整星结构动力学多目标优化为例,建立支持向量机近似模型模拟卫星蜂窝板、碳纤维框架结构设计参数与加速度频率响应、应力响应等非线性映射关系,选用二阶响应面模型作对比。计算结果表明,支持向量机与遗传算法组合优化方法不仅能降低耗时成本,且具精度良好。

摘要：深度卷积神经网络(DCNN)难以针对性地分析图像的特定区域及其相互关系.文中将深度特征与人工设计的特征进行互补结合,提出对图像美学质量评分的方法.首先确定并抽取对美感起主导作用的特定区域,针对该区域及其与其它区域的关系,选择和设计5组美学相关的人工特征,特别是提出线条角度特征和清晰度对比特征.基于Siamese网络结构获取深度特征.选用支持向量回归(SVR)对上述两类特征进行回归预测,并设计基于spearman秩相关系数的权值调节最终的分数.实验表明,文中方法效果较优,与图像美学质量的主观评价具有较好的一致性.

摘要：The data topology structure of uniform experiment design (UD) is too complex to be reasonable regressed. In this paper, the principle and method of distinguish the training data and testing data were described to make a reasonable regression when uniform experiment design combined with support vector regression (SVR). Two equivalent ways which were the smallest enclosing hypersphere perceptron (SEH) and the enclosing simplex perceptron (ES) were provided to discover the topology relationship of the process parameter datum. To give an application, a series of experiments about laser cladding layer quality were conducted by UD to get the relationship of load, velocity and wearing capacity. Results showed that only the testing datum recommended by the two perceptrons got a good forecasting by SVR. Therefore, the two perceptrons could guide experiments with process parameter data of complex topology structure. Further, the application could be extended over a much wider field of experiments.

摘要：In this paper, we present a theoretical codebook design method for VQ-based fast face recognition algorithm to im-prove recognition accuracy. Based on the systematic analysis and classification of code patterns, firstly we theoretically create a systematically organized codebook. Combined with another codebook created by Kohonen’s Self-Organizing Maps (SOM) method, an optimized codebook consisted of 2×2 codevectors for facial images is generated. Experimental results show face recognition using such a codebook is more efficient than the codebook consisted of 4×4 codevector used in conventional algorithm. The highest average recognition rate of 98.6% is obtained for 40 persons’ 400 images of publicly available face database of AT&T Laboratories Cambridge containing variations in lighting, posing, and expressions. A table look-up (TLU) method is also proposed for the speed up of the recognition processing. By applying this method in the quantization step, the total recognition processing time achieves only 28 msec, enabling real-time face recognition.

摘要：A novel digital implementation of speed controller for a Permanent Magnet Synchronous Motor (PMSM) with disturbance rejection using conventional observer combined with Extended Kalman Filter (EKF) is proposed. First, the EKF is constructed to achieve a precise estimation of the speed and current from the noisy measurement. Second, a proportional integral derivative (PID) controller is developed based on Linear Quadratic Regulator (LQR) to achieve speed command tracking performance. Then, an observer is designed and its error is utilized to provide load disturbance compensation. The proposed method greatly enhances the PMSM performance by reducing the control signal variation as well as the disturbance. The speed control performance is significantly improved compared to the case when we have an observer acting alone. The simulation results for the speed response and variation of the states when the PMSM is subjected to the load disturbance are presented. The results verify the effectiveness of the proposed method.

摘要：基于XML标准的SVG是一种描述二维矢量图像的语言,对WebGIS的构建具备良好的可用性和适用性.提出了一个建立基于SVG的WebGIS系统的体系结构,将之应用于重庆大学校园电子地图系统中,证明了方案的可行性和实用性.对系统实现的关键技术进行了详细阐述:SVG空间数据组织编码方法;SVG电子地图的制作;SVG空间数据存储和系统客户端实现.

摘要：参考Genebank发表的西尼罗热病毒(WestNilevirus,WNV)E糖蛋白基因序列,自行设计合成一对引物,对WNV进行RT-PCR扩增,产物经琼脂糖电泳分析,呈现一条约400bp的条带,将其克隆入pMD18-T-vector载体中,并进行序列测定,与已发表的WNV基因比较发现,核苷酸的同源性为99.7%,证实为WNV的E基因,通过对样品多次检测,都能扩增出一条约400bp的条带,表明该方法比较稳定。

摘要：目前国内缺乏一种快速、准确预测CO2非混相驱油效果的方法,为了解决这一问题,选取剩余地层压力与混相压力之比、孔隙度、渗透率、油藏中深、地层平均有效厚度、地层温度、原油相对密度、含油饱和度、原油黏度、渗透率变异系数、注采比、注入速度和水气交替注入比等13个地质及工程参数作为输入参数,平均单井日增油量作为输出参数构建了预测CO2非混相驱效果的支持向量机预测模型。以国内6个CO2非混相驱项目和1个CO2混相驱项目为学习样本,2个CO2非混相驱项目和1个CO2混相驱项目为检测样本检测了支持向量机预测模型的准确度,结果表明,3个检测样本的预测值与实际值的平均相对误差为5.57%,满足工程要求。利用该模型预测了腰英台油田CO2非混相驱井组的增产效果,与实际增产效果相比,相对误差仅为1.30%。这表明,采用支持向量机方法对CO2非混相驱油效果进行预测可行且有效。

摘要：介绍了一种基于图片的线切割设计与加工方法,综合运用了Algo Lab Photo vector、燕秀工具箱、CAXA线切割软件实现了高效率图形设计。该方法可应用于艺术画、美术字等没有固定尺寸的设计与加工,也可在学校电加工创新实习方面大力推广,在拓展学生的设计思维和空间想象力、激发学习的兴趣和创新的潜力、提高实践和综合应用能力等方面有显著效果。